How to Make Graphs on the TI-84 Plus

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The TI-84 Plus is another in a long line of graphing calculators by Texas Instruments. Make graphs on the TI-84 Plus with help from an experienced educator in this free video clip.

Part of the Video Series: Lessons in Math
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Video Transcript

Hi, my name is Marija. I'm a mathematician, and today I'm going to tell you how to make graphs on the TI-84 Plus. So in your calculator you're going to look for the button on the upper left hand corner that says Y equals, so a lot of people try to go to graph right away, you can't you need to go to Y equals. So look on your calculator, upper left hand corner, you're going to see the button Y equals. Then you're going to get a list of Y1 equals, Y2 equals, sorry Y3 equals and so on and so forth. So if you're graphing a system you're going to have to fill in more than one of these but if you're just graphing a line or a quadratic you're just going to use one line so let's say I'm graphing a quadratic and I'm given X squared plus 3X plus 2. You're going to go ahead and just type that right into your calculator and then you're going to hit the button that says graph, okay. Now a couple of things to beware of, if you had a negative, if this was a negative X squared, don't use the minus button. I know that with a lot of the regular scientific calculators, they're interchangeable, it's not on the TI-84 Plus. You have to use the negative sign which is all the way at the bottom on the right side of the 0 there's a negative sign. So make sure you use that and not the minus sign. The second thing to beware is if you can't see the whole graph, so this is going to graph an upside down parabola, if you only see that part of it, if that's all you're getting on the graph, that means that your window is too small. So your axes might only go up to 2 on the positive side, 2 on the negative side and up and down so where you have to go is to the button that says window which is in the same row as the Y equals in the graph so you go to window and what you want to do is always have your X minimum, X maximum, Y minimum, Y maximum set at negative 10, 10, negative 10, 10 respectively. So set your X min to negative 10, X max to positive 10 and do the same thin with the Ys and all that does is make sure that you have a graph that goes up to 10 this way, up to 10 this way, down to negative 10 and over to negative 10 which gives you a good space okay? And if you're still only seeing part of your graph, then just make your window even bigger, make it go up to 20 and just test it out. So those are the basics of using the TI-84. My name is Marija and I just told you how to graph on the TI-84 Plus.

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